William s



(No Model.)

W. S. GRUBB.

APPLYING BOILBR GOVERINGS.

NA PETERS Pme-mudar. wnhingmn. uc.

iNrTnD STATES PATENT OFFICE.

VILLIAM S. GBUBB, OF BARABOO, VISCONSIN.

APPLYING BOILER-covamnes.

r- A. L`EC 'F \T forming part of Letters Patent No. 317,530, dated May 12,1885.

Application lilerl December 6, 1884. (No model.l

To @ZZ whom it may concern:

Be it known that l, VILLIAM S. GRUBB, of Baraboo, county of Sauk, and State of Wisconsin, have invented certain new and useful Improvements in Applying Boiler-Coverings, of which the following is a full, clear, and exact description, reference being had to the accon1- panying drawings, and to the letters of reference marked thereon.

My invention has relation to the application of non-conducting coverings to steam-boilers, steam-pipes, and othervessels, which coverings are employed for retaining or excluding heat or cold. Of these coverings there are many varieties;v but my present invention relates, chiefly, to thekind or class described in my Patent No. 302,630, dated July 29, 1884, or to others of an analogous class wherein plastic materials predominate. This class uof compounds has heretofore been applied directly upon the boiler or vessel while in a plastic state, as with a trowel, and the covering thus supplied. dried rapidly by the excessive interior heat, and there resultsfrom this mode of application cracks or fissures in the covering,which require care and attention to remedy, besides destroying the efficiency of the covering. Experience demonstrates that of the above-named class of compounds those which are allowed to dry slowly become much more efficient nonconductors than those which are dried rapidly, and the covering or coating as formerly practiced requires great skill and expedition not ordinarily attainable, and frequently results in the production of a coating of varying thickness.

The object of my invention is to simplify and improve the manner of applying the above-named kinds of covering, rendering them easy of application without skilled labor, uniform in thickness, thoroughly efcient for non-conducting purposes, and not subject to cracks or iissures. To accomplish this my improvements involve certain novel and useful features, which will be hereinafter rst fully explained, and then pointed out in the claims.

In the accompanying drawings, forming part of this specification, Figure l is a crosssection of a trough or mold in which the material may be formed. Fig. 2 is a cross-section of a slab of the material and the dryingboard upon which it rests. Fig. 3 is a sectional view showinga series of drying-boards with the slabs thereon located one above the other in position to facilitate t-he drying or curing process. Figs. 4, 5, and 6 are crosssections of boilers, showing the manner of appl ying the slabs to the vessels for the purposes intended. Fig. 7 is a side View ol' a fragment of a boiler, showing the slabs applied thereon and arranged to break joints; and Fig. 8 is a similar view showing another manner of arranging the slabs. Fig. 9 is a sectional View illustrating a number ofthe slabs with a wire or string passing through staples on each. Fig. l0 is a sectional view showing the covering applied and completed.

In all these gures like letters of reference, wherever they occur, indicate corresponding parts.

the slabs. This may be of any desired form or size, and is usually of such depth as to form a slab or tile of between two and three inches in thickness. The plastic material is placed in the mold, and when sufficiently firm the mold may be inverted,in order that it may be disengaged from the slab.

Any other suitable means may be employed for forming the slab-as, forinstauce,any of the forms of molding-machines, such as are employed for molding brick, Sec.

B is a drying-board of suitable size. This receives the slab a from the mold, adhesion between the two being prevented by use of a thin strip, as of cloth or paper, C. A number of thedrying-boards, with the slabs thereon, may be conveniently arranged, as indicated in Fig. 3, the boards being separated by suitable strips, as D, allowing ample space for circulation of air around the slabs. Slow drying by exposure to the atmosphere, under cover, is preferred; but the process may, if desired, be assisted by the application of a moderate degree of heat after the manner of any of the well-known processes for drying.

E represents a boiler or other vessel to be covered. I take one of the slabs, cured or dried, as above explained, and place upon it a layer of soft material (represented at b) ot' kaolin or clay, which may or may not be mixed with a trifle of some material, such as jute or hair. This layer is thick enough to receive the projecting rivets or other irregularities A represents a mold suitable for shaping IOC upon theV surface of the boiler. rlhe slab is then pressed to place beneath the lower portion ofthe vessel, as indicated in Fig. 4, and is sustained by a wire or string, e, passed around the vessel and secured at the top or other convenient point. rIhis being aecomplished, the next adjacent slab is similarly prepared, and the wire c bent down close to or embedded in the iirst slab, so that the second may be loeated'close tothe rst, and after being placed in position the second slab is sustained by a wire or string, d, secured like c. All the slabs below the middle of the vessel are secured in a manner sufficiently indicated above. Above the middle portion it is apparent that'the sustaining-wires Vwill not be required, each slab iinding its support upon the slab below or upon the surface of the boiler when the upper portion is reached. Thejoints between the slabs may be made secure by the application of a trifle of kaolin; but under ordinary circumstances the coating of kaolin applied over the exterior after the slabs are in place will be sufficient. Then all the slabs are in place, they may be finally wound with wire (represented at e e) to insure them being securely held in position, and over the whole exterior surface I apply (with a trowel or otherwise) a finishing coat Ot' kaolin mixed or not; Withj nte or: hair, the same being represented utf, Fig. 10.

Instead ol applying the sustaining-wires over the exterior of the lowermost slabs, the

wire c maybe passed through staples g in a number of the slabs, as represented in Fig. 9, and these slabs may be applied to the surface to be covered at one time, as will be readily understood. Upon the sides of the boiler the slabs :may be arranged so that the joints in one row will not coincide with those in the next, as represented in Fig. 7, or the slabs may be otherwise disposed, as indicated in Fig. S.

The covering applied after the manner above explained will be found to answer the purpose or object of the invention, as previously set forth.

Having now fully described my invention,

YYwhat I claim asV new, and desire toi'secure by Letters Patent, is-

The herein-described method of applying boiler-coverings, consisting in drying thematerial composing the covering` in separate slabs of suitable thickness, applying moist kaolin tothe surface of the slabs sustaining .them beneath the vessel, substantially as eX- plained, then wrapping the covering and applying a finishing coat, substantially as set forth.

In testimony that I elainl tlie'foregoing I have hereunto set my hand in the presence of XVitn esses JOHN BUcKLnn, NVORTH Oscoop. 

